The biggest lake in California is shrinking. The Salton Sea occupies a hot, desert basin a short drive from the Mexico border and it’s been evaporating for years. From the air the lake is pear-shaped, bordered by an intense concentration of farms growing winter vegetables on its south end, and date palms, citrus and brussels sprouts to the north. It’s sustained by the Colorado River water that passes through these farms as irrigation before flowing into the 350 square mile lake. The fact the lake is disappearing isn’t a shock.